mediatek: filogic: add SD card support to GatoNetworks GDSP

The device is equipped with a GPS module, reporting data via /dev/ttyS1.
A TF card reader is also present. Only one of those components can be
used at once, since they share some PINs.
This commit adds two devicetree overlays to allow for the user to select
the desired configuration. Another overlay configuration to allow booting
from SD card is provided.

Signed-off-by: Enrico Mioso <mrkiko.rs@gmail.com>

target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-gps.dtso

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "gatonetworks,gdsp", "mediatek,mt7981";
+
+	fragment@0 {
+		target = <&uart1>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};

target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd-boot.dtso

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "gatonetworks,gdsp", "mediatek,mt7981";
+
+	fragment@1 {
+		target = <&mmc0>;
+		__overlay__ {
+			card@0 {
+				compatible = "mmc-card";
+				reg = <0>;
+
+				partitions {
+					compatible = "gpt-partitions";
+
+					sdmmc_fit: block-partition-fit {
+						partname = "FIT";
+					};
+				};
+			};
+		};
+	};
+};
+
+&{/chosen} {
+	rootdisk = <&sdmmc_fit>;
+};

target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp-sd.dtso

@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+
+/dts-v1/;
+/plugin/;
+
+/ {
+	compatible = "gatonetworks,gdsp", "mediatek,mt7981";
+
+	fragment@0 {
+		target = <&mmc0>;
+		__overlay__ {
+			status = "okay";
+		};
+	};
+};

target/linux/mediatek/dts/mt7981b-gatonetworks-gdsp.dts

@@ -127,6 +127,23 @@
 	status = "okay";
 };
 
+&mmc0 {
+	status = "disabled";
+
+	#address-cells = <1>;
+	#size-cells = <0>;
+	pinctrl-names = "default", "state_uhs";
+	pinctrl-0 = <&mmc0_pins_default>;
+	pinctrl-1 = <&mmc0_pins_uhs>;
+	bus-width = <4>;
+	max-frequency = <50000000>;
+	cap-sd-highspeed;
+	vmmc-supply = <&reg_3p3v>;
+	vqmmc-supply = <&reg_3p3v>;
+	no-mmc;
+	no-sdio;
+};
+
 &eth {
 	status = "okay";
 
@@ -334,6 +351,56 @@
 		};
 	};
 
+	mmc0_pins_default: mmc0-pins-default {
+		mux {
+			function = "flash";
+			groups = "emmc_45";
+		};
+		conf-cmd-dat {
+			pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO",
+				"SPI0_CS",  "SPI0_HOLD", "SPI0_WP",
+				"SPI1_CLK", "SPI1_MOSI", "SPI1_MISO";
+			input-enable;
+			drive-strength = <MTK_DRIVE_4mA>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+		};
+		conf-clk {
+			pins = "SPI1_CS";
+			drive-strength = <MTK_DRIVE_8mA>;
+			bias-pull-down = <MTK_PUPD_SET_R1R0_10>;
+		};
+		conf-rst {
+			pins = "PWM0";
+			drive-strength = <MTK_DRIVE_4mA>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+		};
+	};
+
+	mmc0_pins_uhs: mmc0-pins-uhs {
+		mux {
+			function = "flash";
+			groups = "emmc_45";
+		};
+		conf-cmd-dat {
+			pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO",
+				"SPI0_CS",  "SPI0_HOLD", "SPI0_WP",
+				"SPI1_CLK", "SPI1_MOSI", "SPI1_MISO";
+			input-enable;
+			drive-strength = <MTK_DRIVE_4mA>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+		};
+		conf-clk {
+			pins = "SPI1_CS";
+			drive-strength = <MTK_DRIVE_8mA>;
+			bias-pull-down = <MTK_PUPD_SET_R1R0_10>;
+		};
+		conf-rst {
+			pins = "PWM0";
+			drive-strength = <MTK_DRIVE_4mA>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+		};
+	};
+
 	uart2_pins: uart2-pins {
 		mux {
 			function = "uart";
@@ -368,7 +435,7 @@
 &uart1 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart1_pins>;
-	status = "okay";
+	status = "disabled";
 };
 
 &uart2 {

target/linux/mediatek/filogic/base-files/lib/upgrade/platform.sh

@@ -269,6 +269,7 @@ platform_copy_config() {
 	bananapi,bpi-r4-2g5|\
 	bananapi,bpi-r4-poe|\
 	cmcc,rax3000m|\
+	gatonetworks,gdsp|\
 	mediatek,mt7988a-rfb)
 		if [ "$CI_METHOD" = "emmc" ]; then
 			emmc_copy_config

target/linux/mediatek/image/filogic.mk

@@ -30,6 +30,14 @@ define Build/mt7988-bl31-uboot
 	cat $(STAGING_DIR_IMAGE)/mt7988_$1-u-boot.fip >> $@
 endef
 
+define Build/simplefit
+	cp $@ $@.tmp 2>/dev/null || true
+	ptgen -g -o $@.tmp -a 1 -l 1024 \
+	-t 0x2e -N FIT		-p $(CONFIG_TARGET_ROOTFS_PARTSIZE)M@17k
+	cat $@.tmp >> $@
+	rm $@.tmp
+endef
+
 define Build/mt798x-gpt
 	cp $@ $@.tmp 2>/dev/null || true
 	ptgen -g -o $@.tmp -a 1 -l 1024 \
@@ -948,15 +956,23 @@ define Device/gatonetworks_gdsp
   DEVICE_VENDOR := GatoNetworks
   DEVICE_MODEL := gdsp
   DEVICE_DTS := mt7981b-gatonetworks-gdsp
+  DEVICE_DTS_OVERLAY := \
+  mt7981b-gatonetworks-gdsp-gps \
+  mt7981b-gatonetworks-gdsp-sd \
+  mt7981b-gatonetworks-gdsp-sd-boot
   DEVICE_DTS_DIR := ../dts
+  DEVICE_DTC_FLAGS := --pad 4096
   IMAGES := sysupgrade.itb
   IMAGE_SIZE := 32768k
-  DEVICE_PACKAGES := fitblk kmod-mt7915e kmod-mt7981-firmware \
+  DEVICE_PACKAGES := e2fsprogs f2fsck mkf2fs fitblk \
+    kmod-mt7915e kmod-mt7981-firmware \
     kmod-usb-net-qmi-wwan kmod-usb-serial-option kmod-usb3 \
     mt7981-wo-firmware -kmod-phy-aquantia
-  ARTIFACTS := preloader.bin bl31-uboot.fip
+  ARTIFACTS := preloader.bin bl31-uboot.fip sdcard.img.gz
   ARTIFACT/preloader.bin := mt7981-bl2 nor-ddr3
   ARTIFACT/bl31-uboot.fip := mt7981-bl31-uboot gatonetworks_gdsp
+  ARTIFACT/sdcard.img.gz := simplefit |\
+  append-image squashfs-sysupgrade.itb | check-size | gzip
   KERNEL := kernel-bin | gzip
   KERNEL_INITRAMFS := kernel-bin | lzma | \
 	fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb with-initrd | pad-to 64k